RFR (10,9,8): Cleanup shared code

[Aleksey Shipilev]

On 07/11/2017 09:14 PM, Roman Kennke wrote:
> I found some small/trivial diffs between Shenandoah's shared code and
> upstream's shared code:
> 
> http://cr.openjdk.java.net/~rkennke/cleanup-shared/webrev.00/
> <http://cr.openjdk.java.net/%7Erkennke/cleanup-shared/webrev.00/>

Yup, do it.

-Aleksey